MPCNC, IS IT WORTH YOUR TIME AND MONEY?
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- เผยแพร่เมื่อ 12 พ.ย. 2022
- This project took me a long time to finish, but I finally got it to where I need it and got it to move and work. I hit many hurdles along the way as this had to work in the way I wanted it.
Main Issue I had was the USB cable extension cord which caused all the issues and once it was eliminated, the machine did it's thing.
Your first test cut was a 5 hour job!?! Heck of a job, it gets a lot easier after the first one. Keep having fun and welcome to the crew.
Thank you, and thanks for your great design.
Admitting one’s mistakes is always humbling and a true lesson. Great looking machine and great troubleshooting. Looking to build one soon. Thanks for sharing
I'm also doing some research and want to build myself a CNC. Try googling about the Root 4 Lite project, i'm leaning towards building that one.
Thanks for sharing your experience with MPCNC. I also ventured into building one last year with no prior knowledge of what CNC was or how it works. I am grateful that I spent the time, money and energy building the machine. The machine worked for a while and my cuts were not great due to a number of build errors that I made, I just was not able to get it to square and I followed all the excellent instructions from the site and forum. When it cuts, the circles are not round and rectangles are not accurate all because of user construction errors. All attempts (re-printing several models that were getting loose) to fix the squaring finally broke the machine that it started making wired noise and breaking bits.
In conclusion, was it worth it for me, absolutely YES. Now I am able to understand the principle of how the machine works and able to write my own gcodes and scripts to do things my way and even played around with modifying Marlin and flashing the firmware. I took the machine down and bought a fairly inexpensive machine that I was able to modify its cutting area myself and I have started using it to cut and results so far are promising. I used the knowledge I had interacting with Marlin to make GRBL to work for me the way I wanted. What I could not do about seven months ago, so thank you V1 Eng.
This is why I started this channel to show the challenges ordinary folks face and not just how easy it is to do things. I'd like to capture the faults and errors as often as I can. Thank you for the comment.
The grey C looking shaped ring close to the bit. Is this for a dust shoe that is adjustable? Is there a project on Thingiverse for it? Great job! I have an old burly. The whole project was an experience.
Yes the grey C shape is for a dust collection but It didn't work well for me,
This actually works better for me: www.thingiverse.com/thing:2836280
I noticed that your mount for the router is different than the stock mount.... you don't need the router at at 45 degree angle and your mount seems quite a bit more robust. Can you share a link to the print files or any info about the mount? I've got the same router, and am at the stage of the build where the electronics and the router get installed. Super excited to get it working.
This is what I used
www.thingiverse.com/thing:1759272
@@diydadhub got the files.... but there are 6 different stl's in there.... and I see a v2 for a couple of them.... could you be specific on which ones you used? Sorry to be duh...
Sorry for the late reply, V2 is what I used.
19:25 Hi, I am Jack. Now you know Jack.
Very nice to meet you 🤣🤣🤣
You must learn the basic before doing long jobs.
Don't test equipment on heavy long work until everything is perfect
100% true, the videos I make are mostly to capture my mistake or potential mistakes/errors that could happen. Just to show not everything will be a smooth sailing. Thank you for tuning in.
wait so.. no belts, no screws, and no servos - and you're expecting it to be accurate?
This machine has belts, screws and stepper motors, or else it wouldn't move. I don't know where you got the idea of the machine not having the parts you mentioned.
@@diydadhub couldn't see the belts at first, over the also black tubes. figured it just had rubber wheels rolling on the tubes or something.
so then, there's a few things. those steppers are tiny, and like I said, are not servos. you're missing steps as the motors can't push the axis through the material on some pulses, and the controller doesn't get feedback that the motor didn't move. so either you need stronger motors, or encoders and drives that will use them.
then, those belts are way too thin for how long they are. they're probably stretching as you try to push the machine through the material. maybe even visibly (check if one side of the belt gets slack when cutting through material in one direction along the belt).
the screws I mentioned were axis screws, instead of belts. even a shitty long piece of screw from a hardware store might give you more rigidity than those belts, provided it's thick enough for the length. won't be incredibly precise but neither is the rest of the machine.
and lastly, the tubes are far too long as well, and they're definitely deflecting a fair amount. I'm pretty sure mpcncs aren't meant to be this big. maybe filling them with some rebar and cement, or thick steel bar stock and epoxy might help. cylinders are just generally very bendy.
@@diydadhub but most definitely the biggest problem you have here is the missed steps. it's not user error, your motors just can't keep up. if it were user error your see it in cad/cam.
not that mpcncs like that are a great design to begin with, but it should work with bigger/encoder motors (as well as you can expect it to work anyway).
@@Tristoo I really appreciate the feedback and extra info you have put here. This particular setup actually can handle a lot of stress, and many have had success with it. But with most of the videos, no one show the issue side of these setups. When I say 99% user error, it was just that. The tubes are strong enough to support the weight and they don't sag; the motors are also strong enough to move through the axis. I figured out that my setup had slid out of being square and it was affecting the travel and skips. I will be uploading more videos to show improvements etc...and you may be right, I may be needing bigger motors to make up for size. Once again, I highly appreciate the feedback and welcome it at any point so not just me, but the community can benefit from it.
@@diydadhub being wrong is always a pleasant experience with someone who is courteous. I'm subscribing as a result- it really is a breath of fresh air.
Also while you're not machining metal and rigidity therefore less of a concern, small deflections can show in the final result. I imagine those holes might be a bit tighter at the bottom? Regardless usually the thing to avoid is vibrations - even if those don't really bend a lot (and I'm assuming you're measuring visually here), hitting the machine's resonant frequency for sure will make it bend a good bit. Again, not too too much to worry about with wood, but tool life is always a consideration because vibrations will decrease it by a fair amount. Carbon fiber and plastic are usually pretty good at dampening though so perhaps that helps.
Regardless, unless the out-of-square problem caused considerable extra drag somewhere, I would find it a bit unlikely that it caused the massive alignment issues you saw with the holes. Also, I imagine you must have squared the machine up at the start - missed steps would have caused it to go out of square, and so that would still be your main concern.
Eager to see how it goes, will be waiting for the next video. Thanks!